Whole electric vehicle thermal management system based on multi-way valve and control method of whole electric vehicle thermal management system

Abstract

The invention discloses an electric vehicle thermal management system based on a multi-way valve. Comprising a passenger compartment assembly, a battery pack, an electric drive system, a compressor, a first heat exchanger, a second heat exchanger, an electronic expansion valve, a liquid storage tank, a first water pump, a second water pump, a third water pump, a fourth water pump, a first proportional three-way valve, a second proportional three-way valve, a twelve-way valve and a low-temperature radiator. The thermal management system is highly integrated, and meanwhile the overall performance and controllability of the vehicle are improved. The invention further discloses a control method of the whole electric vehicle heat management system based on the multi-way valve, independent and cooperative control over all the heat management modules can be achieved through the twelve-way valve, the energy efficiency of the heat management system can be powerfully improved, it is ensured that the system can stably operate under various working conditions, and the service life of the system is prolonged. And a twelve-way valve is combined, a full indirect type heat pump technology is adopted, the combination mode of different working modes of all heat management modules of the electric vehicle is expanded, energy utilization is maximized, and meanwhile the cruising ability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management of electric vehicles, and more specifically, to a thermal management system for electric vehicles based on a multi-way valve and a control method thereof. Background Art

[0002] The policies continuously introduced have greatly promoted the development of new energy electric vehicles. In this process, the eight-way valve used in Tesla Model Y is of revolutionary significance. Its benefits are not only in reducing the number of pipes and components in the thermal management system, reducing system complexity, and improving the convenience of system safety maintenance, but also in connecting the different interfaces of the eight-way valve with different components and controlling the rotation of the valve core by the drive device to achieve the connection and switching of different interfaces, taking into full consideration the energy recovery methods such as battery pack waste heat and motor waste heat to optimize the energy flow of the whole vehicle.

[0003] At present, the thermal management system of electric vehicles on the market adopts direct and semi-indirect heat pump technology. The new refrigerant forces the existing thermal management system to gradually transform to full indirect heat pump technology. On this basis, the electric vehicle thermal management system solution based on multi-way valve proposed by different scholars is quite meaningful, but there is still the problem of partial loss of recoverable energy. Summary of the invention

[0004] The purpose of the present invention is to design and develop a thermal management system for electric vehicles based on multi-way valves. The twelve-way valve replaces various structures in the traditional thermal management system of electric vehicles, achieving high integration while improving the overall performance and controllability of the vehicle.

[0005] The present invention also designs and develops a control method for the thermal management system of an electric vehicle based on a multi-way valve. The twelve-way valve can be used to realize individual and coordinated control of each thermal management module, and the twelve-way valve is combined with the use of full indirect heat pump technology to improve the utilization rate of the thermal management system and the vehicle's endurance.

[0006] The technical solution provided by the present invention is:

[0007] A thermal management system for an electric vehicle based on a multi-way valve, comprising:

[0008] 12-way valve; and

[0009] a fourth water pump, the inlet of which is connected to the third port of the twelve-way valve;

[0010] A first heat exchanger, wherein a coolant-side inlet is connected to the outlet of the fourth water pump, and a coolant-side outlet is connected to the second port of the twelve-way valve;

[0011] a heater core, the inlet of which is connected to both the coolant outlet of the first heat exchanger and the second port of the twelve-way valve, and the outlet of which is connected to the first port of the twelve-way valve;

[0012] A low-temperature radiator, two ends of which are respectively connected to the fourth port and the fifth port of the twelve-way valve;

[0013] a third water pump, the inlet of which is connected to the sixth port of the twelve-way valve;

[0014] A second heat exchanger, whose coolant side inlet is connected to the outlet of the third water pump, and whose coolant side outlet is connected to the seventh port of the twelve-way valve;

[0015] A cold air core, the inlet of which is connected to both the coolant side outlet of the second heat exchanger and the seventh port of the twelve-way valve, and the outlet of which is connected to the eighth port of the twelve-way valve;

[0016] An electric drive system loop, one end of which is connected to the ninth port of the twelve-way valve, and the other end of which is connected to the tenth port of the twelve-way valve;

[0017] A battery pack loop, one end of which is connected to the 11th port of the 12-way valve, and the other end of which is connected to the 12th port of the 12-way valve, and the two ends of the battery pack loop can be selectively connected or disconnected with each other;

[0018] The refrigerant side of the first heat exchanger and the refrigerant side of the second heat exchanger can be selectively connected or disconnected with each other.

[0019] Preferably, the battery pack circuit includes:

[0020] a first proportional three-way valve, whose port No. 1 is connected to the port No. 11 of the twelve-way valve, and whose port No. 3 is connected to the port No. 12 of the twelve-way valve;

[0021] a second proportional three-way valve, whose port No. 2 is connected to both the port No. 3 of the first proportional three-way valve and the port No. 12 of the twelve-way valve, and whose port No. 3 is connected to the port No. 2 of the first proportional three-way valve;

[0022] a first water pump, an inlet of which is connected to port No. 2 of the first proportional three-way valve and port No. 3 of the second proportional three-way valve;

[0023] The coolant inlet of the battery pack is connected to the outlet of the first water pump, and the coolant outlet is connected to port No. 1 of the second proportional three-way valve.

[0024] Preferably, the electric drive system circuit includes:

[0025] a second water pump, the inlet of which is connected to the ninth port of the twelve-way valve;

[0026] The electric drive system has a coolant inlet connected to the outlet of the second water pump, and a coolant outlet connected to the tenth port of the twelve-way valve.

[0027] Preferably, it also includes:

[0028] a first kettle, one end of which is connected to the coolant inlet of the second heat exchanger, and the other end of which is connected to the coolant outlet of the second heat exchanger;

[0029] The second kettle has one end connected to the coolant inlet of the first heat exchanger and the other end connected to the coolant outlet of the first heat exchanger.

[0030] Preferably, it also includes:

[0031] a compressor, the inlet of which is connected to the refrigerant-side outlet of the second heat exchanger, and the outlet of which is connected to the refrigerant-side inlet of the first heat exchanger;

[0032] a liquid storage tank, the inlet of which is connected to the refrigerant-side outlet of the first heat exchanger;

[0033] An electronic expansion valve has one end connected to the outlet of the liquid storage tank and the other end connected to the refrigerant side inlet of the second heat exchanger.

[0034] Preferably, it also includes:

[0035] A temperature sensor is arranged at a coolant inlet of the battery pack.

[0036] Preferably, the second water pump, the third water pump and the fourth water pump are integrated on the twelve-way valve.

[0037] A control method for a thermal management system of an electric vehicle based on a multi-way valve, using the thermal management system of an electric vehicle based on a multi-way valve, comprises the following steps:

[0038] Step 1: Collect multiple vehicle status parameters;

[0039] The multiple vehicle status parameters include vehicle speed, temperature and humidity in the passenger compartment, battery pack temperature, electric drive system temperature, and driver intention;

[0040] Step 2: starting and switching different modes according to the multiple vehicle status parameters;

[0041] The starting and switching of different modes include:

[0042] If the passenger compartment temperature is lower than 25°C and the vehicle speed is lower than 25 km / h, the passenger compartment heating mode, battery pack no-demand mode, electric drive reduced efficiency heating mode and air source heat pump heating mode are activated to make the passenger compartment temperature reach or maintain at 25°C;

[0043] If the passenger compartment temperature is lower than 25°C and the vehicle speed is higher than 25 km / h, the passenger compartment heating mode, battery pack no-demand mode and air source heat pump heating mode are activated to make the passenger compartment temperature reach or maintain at 25°C;

[0044] If the battery pack is in the initial charging state and the battery pack temperature is lower than 25°C, the passenger compartment heating mode, battery pack heating mode, electric drive reduced efficiency heating supplementary heating mode and air source heat pump heating mode are activated to make the temperature in the passenger compartment reach or maintain at 25°C;

[0045] If the passenger compartment temperature is below 25°C and the battery pack is in charging state, the passenger compartment heating mode, battery pack heating mode and air source heat pump heating mode are activated so that the temperature in the passenger compartment reaches or remains at 25°C and the battery pack temperature remains at 25°C;

[0046] If the humidity in the passenger compartment is higher than 60%, the battery pack temperature is lower than 25°C, the electric drive system temperature is higher than 85°C and the battery pack is in the initial charging state, the passenger compartment heating mode, battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode are activated to maintain the battery pack temperature at 25°C;

[0047] If the battery pack is in the initial charging state, the battery pack temperature is lower than 25°C and the electric drive system temperature is higher than 185°C, the battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode are activated;

[0048] If the battery pack is in charging state and the battery pack temperature is lower than 25°C, the battery pack heating mode and the air source heat pump heating mode are started to keep the battery pack temperature above 25°C;

[0049] If the front windshield of the passenger compartment is frosted, the driver activates the driving defrost mode;

[0050] If the humidity in the passenger compartment is higher than 60% and the temperature of the electric drive system is higher than 85°C, the passenger compartment dehumidification mode, battery pack no-demand mode, electric drive waste heat utilization mode and air source heat pump heating mode are activated;

[0051] If the temperature in the passenger compartment is 25°C, the battery pack temperature is higher than 45°C, and the electric drive system temperature is higher than 85°C, the battery pack cooling mode and the electric drive heat dissipation mode will be activated;

[0052] If the temperature in the passenger compartment is higher than 25°C, the battery pack temperature is higher than 45°C and the electric drive system temperature is higher than 85°C, the passenger compartment cooling mode, battery pack cooling mode and electric drive heat dissipation mode will be activated.

[0053] Preferably, the step 2 specifically includes:

[0054] When the passenger compartment heating mode, the battery pack no-demand mode, the electric drive reduced-efficiency heating mode, and the air source heat pump heating mode are all started, the twelve-way valve is in the first working mode, and the heater core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the electric drive system, the second water pump, the third water pump, and the fourth water pump are turned on;

[0055] In the passenger compartment heating mode, the battery pack no-demand mode and the air source heat pump heating mode, the twelve-way valve is in the second working mode, and the heater core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the third water pump and the fourth water pump are turned on;

[0056] In the passenger compartment heating mode, battery pack heating mode, electric drive reduced efficiency heating supplementary heating mode and air source heat pump heating mode, the twelve-way valve is in the third working mode, and the heater core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened;

[0057] In the passenger compartment heating mode, the battery pack heating mode and the air source heat pump heating mode, the twelve-way valve is in the fourth working mode, and the heater core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the first water pump, the third water pump, the fourth water pump, the first proportional three-way valve, and the second proportional three-way valve are opened;

[0058] In the passenger compartment heating mode, battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode, the twelve-way valve is in the fifth working mode, and the warm air core, the cold air core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened;

[0059] In the battery pack heating mode, the electric drive waste heat utilization mode and the air source heat pump heating mode, the twelve-way valve is in the sixth working mode, and the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened;

[0060] In the battery pack heating mode and the air source heat pump heating mode, the twelve-way valve is in the seventh working mode, and the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the first water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened;

[0061] In the driving defrost mode, the twelve-way valve is in the eighth working mode, and the warm air core, the cold air core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the electric drive system, the second water pump, the third water pump and the fourth water pump are turned on;

[0062] In the passenger compartment dehumidification mode, the battery pack no-demand mode, the electric drive waste heat utilization mode and the air source heat pump heating mode, the twelve-way valve is in the ninth working mode, and the warm air core, the cold air core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the electric drive system, the second water pump, the third water pump and the fourth water pump are turned on;

[0063] In the battery pack cooling mode and the electric drive heat dissipation mode, the twelve-way valve is in the tenth working mode, and the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened;

[0064] In the passenger compartment cooling mode, battery pack cooling mode and electric drive heat dissipation mode, the twelve-way valve is in the eleventh working mode, and the cold air core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened.

[0065] Preferably, the mode switching of the twelve-way valve includes:

[0066] The first working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port and the tenth port of the twelve-way valve 140 are all open, and the first port and the third port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected;

[0067] The second working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port and the seventh port of the twelve-way valve are all open, and the first port and the third port are interconnected, the fourth port and the seventh port are interconnected, and the fifth port and the sixth port are interconnected;

[0068] The third working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected;

[0069] The fourth working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, and the fifth port and the sixth port are interconnected.

[0070] The fifth working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port, the tenth port, the eleventh port, and the twelfth port of the twelve-way valve are all open, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the eighth port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected;

[0071] The sixth working mode is that the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the second port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected;

[0072] The seventh working mode is that the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the second port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, and the fifth port and the sixth port are interconnected;

[0073] The eighth working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port and the tenth port of the twelve-way valve 140 are all open, and the first port and the fourth port are interconnected, the fifth port and the third port are interconnected, the eighth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected;

[0074] In the ninth working mode, the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port and the tenth port of the twelve-way valve 140 are all open, and the first port and the third port are interconnected, the fourth port and the eighth port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected;

[0075] The tenth working mode is that the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the second port and the fourth port are interconnected, the third port and the fifth port are interconnected, the seventh port and the eleventh port are interconnected, the ninth port and the twelfth port are interconnected, and the sixth port and the tenth port are interconnected;

[0076] The eleventh working mode is that the 2nd port, 3rd port, 4th port, 5th port, 6th port, 8th port, 9th port, 10th port, 11th port and 12th port of the twelve-way valve 140 are all open, and the 2nd port and the 4th port are interconnected, the 3rd port and the 5th port are interconnected, the 6th port and the 10th port are interconnected, the 8th port and the 11th port are interconnected, and the 9th port and the 12th port are interconnected.

[0077] The beneficial effects of the present invention are:

[0078] (1) The present invention designs and develops a thermal management system for electric vehicles based on a multi-way valve, which cleverly integrates the numerous complex valve components of a traditional electric vehicle thermal management system into a twelve-way valve. This not only greatly reduces the number of system pipelines, but also makes the system structure compact. This series of improvements is also conducive to achieving lightweighting of the entire vehicle, reducing energy consumption, and improving the overall performance and handling of the vehicle.

[0079] (2) The control method of the electric vehicle thermal management system based on a multi-way valve designed and developed by the present invention can realize individual and coordinated control of each thermal management module through a twelve-way valve, which can greatly improve the energy efficiency of the thermal management system and ensure that the system can operate stably under various working conditions. In addition, the twelve-way valve is combined with the full indirect heat pump technology to expand the combination of different working modes of each thermal management module of the electric vehicle. While meeting the needs of various thermal management modes of the electric vehicle, the energy beneficial utilization of the thermal management system is maximized, the problem of effective utilization of energy in the entire charging and discharging cycle of the electric vehicle is solved, the battery life of the electric vehicle is improved, and a more lasting travel guarantee is provided for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1It is a schematic structural diagram of the thermal management system of an electric vehicle based on a multi-way valve according to the present invention.

[0081] Figure 2 Schematic diagram of the mode selection structure of the twelve-way valve of the present invention.

[0082] Figure 3 It is a system cycle schematic diagram of the vehicle thermal management system of the present invention in the passenger compartment heating mode, the battery pack no-demand mode, the electric drive reduced-efficiency heating mode and the air source heat pump heating mode.

[0083] Figure 4 It is a schematic diagram of the system cycle of the vehicle thermal management system of the present invention in the passenger compartment heating mode, the battery pack no-demand mode and the air source heat pump heating mode.

[0084] Figure 5 It is a system cycle schematic diagram of the vehicle thermal management system of the present invention in the passenger compartment heating mode, battery pack heating mode, electric drive reduced efficiency heating supplementary heating mode and air source heat pump heating mode.

[0085] Figure 6 It is a schematic diagram of the system cycle of the vehicle thermal management system of the present invention in the passenger compartment heating mode, battery pack heating mode and air source heat pump heating mode.

[0086] Figure 7 It is a system cycle schematic diagram of the vehicle thermal management system of the present invention in the passenger compartment heating mode, battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode.

[0087] Figure 8 It is a schematic diagram of the system cycle of the vehicle thermal management system of the present invention in the battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode.

[0088] Fig. 9 It is a schematic diagram of the system cycle of the vehicle thermal management system of the present invention in the battery pack heating mode and the air source heat pump heating mode.

[0089] Fig.10 It is a schematic diagram of the system cycle of the vehicle thermal management system of the present invention in the driving defrost mode.

[0090] Fig.11 It is a system cycle schematic diagram of the vehicle thermal management system of the present invention in the passenger compartment dehumidification mode, battery pack no-demand mode, electric drive waste heat utilization mode and air source heat pump heating mode.

[0091] Fig.12 It is a schematic diagram of the system cycle of the vehicle thermal management system of the present invention in the battery pack cooling mode and the electric drive heat dissipation mode.

[0092] Fig.13 It is a schematic diagram of the system cycle of the vehicle thermal management system of the present invention in the passenger compartment cooling mode, battery pack cooling mode and electric drive heat dissipation mode. DETAILED DESCRIPTION

[0093] The present invention is further described in detail below so that those skilled in the art can implement it according to the description.

[0094] like Figure 1 As shown, the present invention provides a thermal management system for an electric vehicle based on a multi-way valve, comprising:

[0095] Passenger compartment HVAC assembly, battery pack 160, electric drive system 170, compressor 131, first heat exchanger (WCON) 121, second heat exchanger (Chiller) 122, electronic expansion valve 132, liquid storage tank 133, first water pump 181, second water pump 182, third water pump 183, fourth water pump 184, first proportional three-way valve 191, second proportional three-way valve 192, twelve-way valve 140 and low-temperature radiator 150.

[0096] Among them, the passenger compartment HVAC assembly is provided with a warm air core 111, a cold air core 112 and a blower 113, the blower 113 is placed at the air inlets of the warm air core 111 and the cold air core 112, the warm air core 111 and the cold air core 112 are placed in parallel, the WCON 121 has a refrigerant side and a coolant side, and the Chiller 122 has a refrigerant side and a coolant side.

[0097] In the refrigerant circulation loop, the outlet of the compressor 131 is connected to the refrigerant side inlet of the WCON121, the refrigerant side outlet of the WCON121 is connected to the inlet of the liquid storage tank 133, the outlet of the liquid storage tank 133 is connected to one end of the electronic expansion valve 132, the other end of the electronic expansion valve 132 is connected to the refrigerant side inlet of the Chiller122, and the refrigerant side outlet of the Chiller122 is connected to the inlet of the compressor 131.

[0098] In the coolant circulation loop, the inlet of the first water pump 181 is connected to the 10th port of the 12-way valve 140, and the outlet is connected to the coolant inlet of the battery pack 160. The coolant outlet of the battery pack 160 is connected to the No. 1 port of the second proportional three-way valve 192, the No. 2 port of the second proportional three-way valve 192 is connected to the No. 12 port of the 12-way valve 140, the No. 3 port of the second proportional three-way valve 192 is connected to the inlet of the first water pump 181, and the No. 2 port of the first proportional three-way valve 191 is simultaneously connected to the No. 1 port of the second proportional three-way valve 192. The No. 3 port of the first proportional three-way valve 191 is connected to the No. 2 port of the second proportional three-way valve 192 and the No. 12 port of the twelve-way valve 140, and the No. 1 port of the first proportional three-way valve 191 is connected to the No. 11 port of the twelve-way valve 140; the inlet of the second water pump 182 is connected to the No. 9 port of the twelve-way valve 140, and the outlet is connected to the coolant inlet of the electric drive system 170, and the coolant outlet of the electric drive system 170 is connected to the No. 10 port of the twelve-way valve 140. The port No. 6 of the twelve-way valve 140 is connected to the inlet of the third water pump 183, the outlet of the third water pump 183 is connected to the coolant side inlet of the Chiller 122, the coolant side outlet of the Chiller 122 is simultaneously connected to the inlet of the passenger compartment HVAC assembly inner cooling air core 112 and the seventh port of the twelve-way valve 140, the outlet of the passenger compartment HVAC assembly inner cooling air core 112 is connected to the eighth port of the twelve-way valve 140; the fourth port of the twelve-way valve 140 is connected to the low-temperature radiator The inlet of the low-temperature radiator 150 is connected to the outlet of the low-temperature radiator 150 is connected to the fifth port of the twelve-way valve 140; the third port of the twelve-way valve 140 is connected to the inlet of the fourth water pump 184, the outlet of the fourth water pump 184 is connected to the coolant side inlet of WCON121, the coolant side outlet of WCON121 is simultaneously connected to the inlet of the heater core 111 in the passenger compartment HVAC assembly and the second port of the twelve-way valve 140, and the outlet of the heater core 111 in the passenger compartment HVAC assembly is connected to port No. 1 of the twelve-way valve 140.

[0099] In this embodiment, the second water pump 182 is integrated on the twelve-way valve 140, and the second water pump 182 is directly connected to the 9th port of the twelve-way valve 140; the third water pump 183 is integrated on the twelve-way valve 140, and the third water pump 183 is directly connected to the 6th port of the twelve-way valve 140; the fourth water pump 184 is integrated on the twelve-way valve 140, and the fourth water pump 184 is directly connected to the 3rd port of the twelve-way valve 140.

[0100] In this embodiment, an active grille is installed at the low-temperature radiator 150 .

[0101] In this embodiment, the thermal management system of the electric vehicle also includes: a first kettle 123 and a second kettle 124, wherein one end of the first kettle 123 is connected to the coolant side inlet of the Chiller 122, and the other end is connected to the coolant side outlet of the Chiller 122; one end of the second kettle 124 is connected to the coolant side inlet of the WCON 121, and the other end is connected to the coolant side outlet of the WCON 121, and is used for coolant storage, pressure regulation, coolant status monitoring, exhaust and other aspects.

[0102] In this embodiment, a temperature sensor is provided at the coolant inlet of the battery pack 160 .

[0103] The present invention designs and develops a thermal management system for an electric vehicle based on a multi-way valve, which cleverly integrates the numerous complex valve components of a traditional electric vehicle thermal management system to form a twelve-way valve, which not only greatly reduces the number of system pipelines, but also makes the system structure compact. This series of improvements is also conducive to achieving lightweighting of the entire vehicle, reducing energy consumption, and improving the overall performance and handling of the vehicle.

[0104] The present invention also provides a control method for a thermal management system of an electric vehicle based on a multi-way valve, and using the thermal management system of an electric vehicle based on a multi-way valve, the method comprises the following steps:

[0105] Step 1: Collect vehicle speed, temperature and humidity in the passenger compartment, battery pack temperature, electric drive system temperature, and driver intention;

[0106] The vehicle speed, temperature and humidity in the passenger compartment, battery pack temperature and electric drive system temperature are fed back by the vehicle;

[0107] Step 2: Start and switch different modes according to the above vehicle status parameters, as follows:

[0108] If the passenger compartment temperature is below 25°C and the vehicle speed is below 25km / h, the passenger compartment heating mode, battery pack no-demand mode, electric drive reduced efficiency heating mode and air source heat pump heating mode are activated until the passenger compartment temperature reaches or remains at 25°C, and the vehicle speed, passenger compartment temperature and humidity, battery pack temperature, electric drive system temperature and / or the driver's intention change to suit other modes;

[0109] If the passenger compartment temperature is below 25°C and the vehicle speed is above 25 km / h, the passenger compartment heating mode, battery pack no-demand mode and air source heat pump heating mode are activated until the passenger compartment temperature reaches or remains at 25°C, and the vehicle speed, passenger compartment temperature and humidity, battery pack temperature, electric drive system temperature and / or driver intention change to suit other modes;

[0110] If the battery pack is in the initial charging state and the battery pack temperature is below 25°C, the passenger compartment heating mode, battery pack heating mode, electric drive reduced efficiency heating supplementary heating mode and air source heat pump heating mode are activated until the passenger compartment temperature reaches or remains at 25°C, and the vehicle speed, passenger compartment temperature and humidity, battery pack temperature, electric drive system temperature and / or driver intention change to suit other modes;

[0111] If the passenger compartment temperature is below 25°C and the battery pack is in the charging state, the passenger compartment heating mode, battery pack heating mode and air source heat pump heating mode are activated until the passenger compartment temperature reaches or remains at 25°C and the battery pack temperature remains at 25°C, and the vehicle speed, passenger compartment temperature and humidity, battery pack temperature, electric drive system temperature and / or the driver's intention change to suit other modes;

[0112] If the humidity in the passenger compartment is higher than 60%, the battery pack temperature is lower than 25°C, the electric drive system temperature is higher than 85°C and the battery pack is in the initial charging state, the passenger compartment needs to be dehumidified, then the passenger compartment heating mode, battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode are activated until the battery pack temperature is maintained at 25°C, the vehicle speed, passenger compartment temperature and humidity, battery pack temperature, electric drive system temperature and / or the driver's intention change to suit other modes;

[0113] If the battery pack is in the initial charging state, the battery pack temperature is lower than 25°C and the electric drive system temperature is higher than 85°C, the battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode are activated until the vehicle speed, passenger compartment temperature and humidity, battery pack temperature, electric drive system temperature and / or driver intention change to suit other modes;

[0114] If the battery pack is in the charging state and the battery pack temperature is below 25°C, the battery pack heating mode and the air source heat pump heating mode are activated until the battery pack temperature is maintained above 25°C, the vehicle speed, passenger compartment temperature and humidity, battery pack temperature, electric drive system temperature and / or the driver's intention change to suit other modes;

[0115] If the front windshield of the passenger compartment is frosted, the driver activates the driving defrost mode until the driver's intention, vehicle speed, passenger compartment temperature and humidity, battery pack temperature and / or electric drive system temperature change to suit other modes;

[0116] If the humidity in the passenger compartment is higher than 60% and the temperature of the electric drive system is higher than 85°C, and the humidity in the passenger compartment is higher than the humidity suitable for passengers, the passenger compartment dehumidification mode, battery pack no-demand mode, electric drive waste heat utilization mode and air source heat pump heating mode will be activated until the driver's intention, vehicle speed, passenger compartment temperature and humidity, battery pack temperature, and electric drive system temperature change to suit other modes;

[0117] If the passenger compartment temperature is 25°C, the battery pack temperature is above 45°C and the electric drive system temperature is above 85°C, the battery pack cooling mode and the electric drive cooling mode are activated until the driver's intention, vehicle speed, passenger compartment temperature and humidity, battery pack temperature and / or electric drive system temperature change to suit other modes;

[0118] If the temperature in the passenger compartment is higher than 25°C, the battery pack temperature is higher than 45°C, and the electric drive temperature is higher than 85°C, the passenger compartment cooling mode, battery pack cooling mode, and electric drive heat dissipation mode are activated until the driver's intention, vehicle speed, passenger compartment temperature and humidity, battery pack temperature, and electric drive system temperature change to suit other modes;

[0119] like Figure 2 As shown, the present invention provides a twelve-way valve control system, including a first working mode, a second working mode, a third working mode, a fourth working mode, a fifth working mode, a sixth working mode, a seventh working mode, an eighth working mode, a ninth working mode, a tenth working mode and an eleventh working mode.

[0120] like Figure 3As shown, when the passenger compartment heating mode, the battery pack no-demand mode, the electric drive reduced-efficiency heating mode and the air source heat pump heating mode are jointly started, the twelve-way valve control system is in the first working mode, that is, the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port and the tenth port of the twelve-way valve 140 are all opened, and the first port and the third port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, the sixth port and the tenth port are interconnected, and the heater core 111, WCON121, Chil The coolant enters the coolant side inlet of the WCON121 driven by the fourth water pump 184, flows out through the coolant side outlet of the WCON121 and enters the heater core 111 in the passenger compartment HVAC assembly, flows out through the heater core 111 in the passenger compartment HVAC assembly and enters the first port of the twelve-way valve 140, flows out through the first port of the twelve-way valve 140 and enters the second port of the twelve-way valve 140. 3 port, flows out through the 3rd port of the 12-way valve 140 and enters the inlet of the fourth water pump 184 to form a circulation loop; at the same time, the coolant enters the coolant side inlet of the Chiller 122 driven by the third water pump 183, flows out through the coolant side outlet of the Chiller 122 and enters the 7th port of the 12-way valve 140, flows out through the 7th port of the 12-way valve 140 and enters the 4th port of the 12-way valve 140, flows out through the 4th port of the 12-way valve (23) and enters the inlet of the low-temperature radiator 150, and flows out through the low-temperature radiator 150. 0 flows out from the outlet and enters the 5th port of the 12-way valve 140, flows out through the 5th port of the 12-way valve 140 and enters the 9th port of the 12-way valve 140, flows out through the 9th port of the 12-way valve 140 and enters the inlet of the second water pump 182, flows out through the outlet of the second water pump 182 and enters the coolant inlet of the electric drive system 170, flows out through the coolant outlet of the electric drive system 170 and enters the 10th port of the 12-way valve 140, and flows out through the 10th port of the 12-way valve 140 and enters the 6th port of the 12-way valve 140, forming a circulation loop.

[0121] like Figure 4As shown, in the passenger compartment heating mode, the battery pack no-demand mode and the air source heat pump heating mode, the twelve-way valve control system is in the second working mode, that is, the first port, the third port, the fourth port, the fifth port, the sixth port and the seventh port of the twelve-way valve are all open, and the first port and the third port are interconnected, the fourth port and the seventh port are interconnected, and the fifth port and the sixth port are interconnected. The heater core 111, WCON121, Chiller122, the low-temperature radiator 150, the third water pump 183 and the fourth water pump 184 are turned on. The coolant enters the coolant side inlet of the WCON121 driven by the fourth water pump 184, flows out through the coolant side outlet of the WCON121 and enters the heater core 111 in the passenger compartment HVAC assembly, flows out through the heater core 111 in the passenger compartment HVAC assembly and enters the first port of the twelve-way valve 140, and flows out through the heater core 111 in the passenger compartment HVAC assembly and enters the first port of the twelve-way valve 140. The coolant flows out from the first port of the twelve-way valve 140 and enters the third port of the twelve-way valve 140, flows out through the third port of the twelve-way valve 140 and enters the inlet of the fourth water pump 184, forming a circulation loop; the coolant enters the coolant side inlet of the Chiller 122 driven by the third water pump 183, flows out through the coolant side outlet of the Chiller 122 and enters the seventh port of the twelve-way valve 140, flows out through the seventh port of the twelve-way valve 140 and enters the fourth port of the twelve-way valve 140, flows out through the fourth port of the twelve-way valve 140 and enters the inlet of the low-temperature radiator 150, flows out through the outlet of the low-temperature radiator 150 and enters the fifth port of the twelve-way valve 140, flows out through the fifth port of the twelve-way valve 140 and enters the sixth port of the twelve-way valve 140, and flows out through the sixth port of the twelve-way valve 140 and enters the inlet of the third water pump 183, forming a circulation loop.

[0122] like Figure 5As shown, in the passenger compartment heating mode, battery pack heating mode, electric drive reduced efficiency heating supplementary heating mode and air source heat pump heating mode, the twelve-way valve control system is in the third working mode, that is, the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, the sixth port and the tenth port are interconnected, and the heating The wind core 111, WCON121, Chiller122, low-temperature radiator 150, battery pack 160, electric drive system 170, first water pump 181, second water pump 182, third water pump 183, fourth water pump 184, first proportional three-way valve 191 and second proportional three-way valve 192 are opened, and the coolant is sent to the coolant side inlet of the WCON121 driven by the fourth water pump 184, flows out through the coolant side outlet of the WCON121 and enters the coolant inlet of the warm air core 111 in the passenger compartment HVAC assembly, and flows through the warm air core 111 in the passenger compartment HVAC assembly. The coolant outlet of the body 111 flows out and enters the first port of the twelve-way valve 140, flows out through the first port of the twelve-way valve 140 and enters the 11th port of the twelve-way valve 140, flows out through the 11th port of the twelve-way valve 140 and enters the No. 1 port of the first proportional three-way valve 191, and part of the coolant flows out from the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181, flows out through the outlet of the first water pump 181 and enters the coolant inlet of the battery pack 160, flows out through the coolant outlet of the battery pack 160 and enters the No. 1 port of the second proportional three-way valve 192. Port, part of the coolant flows out through the No. 2 port of the second proportional three-way valve 192 and mixes with the coolant flowing out through the No. 3 port of the first proportional three-way valve 191 and enters the 12th port of the 12-way valve 140, flows out through the 12th port of the 12-way valve 140 and enters the 3rd port of the 12-way valve 140, flows out through the 3rd port of the 12-way valve 140 and enters the inlet of the fourth water pump 184, part of the coolant flows out through the No. 3 port of the second proportional three-way valve 192 and mixes with the coolant flowing out through the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181;At the same time, the coolant is driven by the third water pump 183 to be sent to the coolant side inlet of the Chiller 122, flows out through the coolant side outlet of the Chiller 122 and enters the 7th port of the 12-way valve 140, flows out through the 7th port of the 12-way valve 140 and enters the 4th port of the 12-way valve 140, flows out through the 4th port of the 12-way valve 140 and enters the inlet of the low-temperature radiator 150, flows out through the outlet of the low-temperature radiator 150 and enters the 5th port of the 12-way valve 140, flows out through the 9th port of the 12-way valve 140 and enters the inlet of the second water pump 182, flows out through the outlet of the second water pump 182 and enters the coolant inlet of the electric drive system 170, flows out through the coolant outlet of the electric drive system 170 and enters the 10th port of the 12-way valve 140, and flows out through the 10th port of the 12-way valve 140 and enters the 40, flows out through the 6th port of the 12-way valve 140 and enters the inlet of the third water pump 183 to form a circulation loop, wherein the coolant inlet temperature is fed back by the temperature sensor at the inlet of the battery pack 160 to adjust the water flow distribution ratio of the No. 2 and No. 3 ports of the first proportional three-way valve 191 and the water flow distribution ratio of the No. 2 and No. 3 ports of the second proportional three-way valve 192. When the inlet temperature of the battery pack 160 is higher than 45°C, the valve opening of the first proportional three-way valve 191 is adjusted to increase the inlet flow of the No. 2 port of the first proportional three-way valve 191 and reduce the inlet flow of the No. 3 port of the first proportional three-way valve 191. At the same time, the valve opening of the second proportional three-way valve 192 is adjusted to increase the inlet flow of the No. 1 port of the second proportional three-way valve 192 and increase the inlet flow of the No. 2 port of the second proportional three-way valve 192 until the inlet temperature of the battery pack 160 reaches 25°C to 45°C. ;

[0123] like Figure 6As shown, in the passenger compartment heating mode, the battery pack heating mode and the air source heat pump heating mode, the twelve-way valve control system is in the fourth working mode, that is, the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the sixth port are interconnected, and the heater core 111, WCON1 21, Chiller 122, low-temperature radiator 150, battery pack 160, first water pump 181, third water pump 183, fourth water pump 184, first proportional three-way valve 191, and second proportional three-way valve 192 are turned on. Driven by the fourth water pump 184, the coolant enters the coolant side inlet of the WCON 121, flows out through the coolant side outlet of the WCON 121, enters the inlet of the heater core 111 in the passenger compartment HVAC assembly, and flows out through the outlet of the heater core 111 in the passenger compartment HVAC assembly. The cooling liquid flows out from the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181, flows out through the outlet of the first water pump 181 and enters the cooling liquid inlet of the battery pack 160, flows out through the cooling liquid outlet of the battery pack 160 and enters the No. 1 port of the second proportional three-way valve 192, and part of the cooling liquid flows out through the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181, flows out through the outlet of the first water pump 181 and enters the cooling liquid inlet of the battery pack 160, flows out through the cooling liquid outlet of the battery pack 160 and enters the No. 1 port of the second proportional three-way valve 192. The coolant flowing out of the No. 2 port and the coolant flowing out of the No. 3 port outlet of the first proportional three-way valve 191 mix and enter the No. 12 port of the twelve-way valve 140, flow out of the No. 12 port of the twelve-way valve 140 and enter the No. 3 port of the twelve-way valve 140, flow out of the No. 3 port of the twelve-way valve 140 and enter the inlet of the fourth water pump 184, and part of the coolant flows out of the No. 3 port of the second proportional three-way valve 192 and mixes with the coolant flowing out of the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181;At the same time, the coolant enters the coolant side inlet of the Chiller 122 driven by the third water pump 183, flows out through the coolant side outlet of the Chiller 122 and enters the 7th port of the 12-way valve 140, flows out through the 7th port of the 12-way valve 140 and enters the 4th port of the 12-way valve 140, flows out through the 4th port of the 12-way valve 140 and enters the inlet of the low-temperature radiator 150, flows out through the outlet of the low-temperature radiator 150 and enters the 5th port of the 12-way valve 140, flows out through the 5th port of the 12-way valve 140 and enters the 6th port of the 12-way valve 140, and flows out through the 6th port of the 12-way valve 140 and enters the inlet of the third water pump 183, forming a circulation loop. , wherein the coolant inlet temperature is fed back by the temperature sensor at the inlet of the battery pack 160 to adjust the water flow distribution ratio of the first proportional three-way valve 191 and the water flow distribution ratio of the second proportional three-way valve 192 and the water flow distribution ratio of the second proportional three-way valve 192. When the water inlet temperature of the battery pack 160 is higher than 45°C, the valve opening of the first proportional three-way valve 191 is adjusted to increase the water flow of the first proportional three-way valve 191 at the port 2 and reduce the water flow of the first proportional three-way valve 191 at the port 3. At the same time, the valve opening of the second proportional three-way valve 192 is adjusted to increase the water flow of the second proportional three-way valve 192 at the port 1 and the water flow of the second proportional three-way valve 192 at the port 2, until the water inlet temperature of the battery pack 160 reaches 25°C to 45°C. ;

[0124] like Figure 7As shown, in the passenger compartment heating mode, battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode, the twelve-way valve is controlled to be in the fifth working mode, that is, the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve are all opened, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the eighth port are interconnected, the fifth port and the ninth port are interconnected, the sixth port and the tenth port are interconnected, and the warm air core 111, the cold air core 112, the W WCON121, Chiller122, low-temperature radiator 150, battery pack 160, electric drive system 170, first water pump 181, second water pump 182, third water pump 183, fourth water pump 184, first proportional three-way valve 191 and second proportional three-way valve 192 are opened, the coolant is driven by the fourth water pump 184 to be delivered to the coolant side inlet of WCON121, flows out through the coolant side outlet of WCON121 and enters the coolant inlet of the heater core 111 in the HVAC assembly in the passenger compartment, and flows out through the coolant outlet of the heater core 111 in the HVAC assembly in the passenger compartment and enters the ten The first port of the two-way valve 140 flows out through the first port of the twelve-way valve 140 and enters the 11th port of the twelve-way valve 140, and flows out through the 11th port of the twelve-way valve 140 and enters the No. 1 port of the first proportional three-way valve 191. Part of the coolant flows out from the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181, flows out through the outlet of the first water pump 181 and enters the coolant inlet of the battery pack 160, flows out through the coolant outlet of the battery pack 160 and enters the No. 1 port of the second proportional three-way valve 192. Part of the coolant flows out through the No. 2 port of the second proportional three-way valve 192. The coolant flowing out of the port is mixed with the coolant flowing out of the No. 3 port outlet of the first proportional three-way valve 191 and enters the 12th port of the 12-way valve 140, flows out through the 12th port of the 12-way valve 140 and enters the 3rd port of the 12-way valve 140, flows out through the 3rd port of the 12-way valve 140 and enters the inlet of the fourth water pump 184, flows out through the outlet of the fourth water pump 184 and enters the coolant side inlet of the WCON 121, and part of the coolant flows out through the No. 3 port of the second proportional three-way valve 192 and mixes with the coolant flowing out of the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181;At the same time, the coolant is driven by the third water pump 183 to be delivered to the coolant side inlet of the Chiller 122, flows out through the coolant side outlet of the Chiller 122 into the cooling air core 112 in the passenger compartment HVAC assembly, flows out through the cooling air core 112 in the passenger compartment HVAC assembly into the 8th port of the 12-way valve 140, flows out through the 8th port of the 12-way valve 140 into the 4th port of the 12-way valve 140, and flows out through the 12-way valve 140 into the 4th port of the 12-way valve 140. The water flows out through the 4th port of the low-temperature radiator 150 and enters the inlet of the low-temperature radiator 150, flows out through the outlet of the low-temperature radiator 150 and enters the 5th port of the 12-way valve 140, flows out through the 5th port of the 12-way valve 140 and enters the 9th port of the 12-way valve 140, flows out through the 9th port of the 12-way valve 140 and enters the inlet of the second water pump 182, flows out through the outlet of the second water pump 182 and enters the coolant inlet of the electric drive system 170, flows out through the coolant outlet of the electric drive system 170 and enters the 10th port of the 12-way valve 140, flows out through the 10th port of the 12-way valve 140 and enters the 6th port of the 12-way valve 140, and flows out through the 6th port of the 12-way valve 140 and the inlet of the third water pump 183 to form a circulation loop; wherein, the coolant inlet temperature is fed back by the temperature sensor at the inlet of the battery pack 160 to adjust the water flow distribution ratio of the No. 2 and No. 3 ports of the first proportional three-way valve 191 and the water flow of the No. 2 and No. 3 ports of the second proportional three-way valve 192 Distribution ratio, when the water inlet temperature of the battery pack 160 is higher than 45°C, adjust the valve opening of the first proportional three-way valve 191 to increase the water inlet flow of port 2 of the first proportional three-way valve 191 and reduce the water inlet flow of port 3 of the first proportional three-way valve 191. At the same time, adjust the valve opening of the second proportional three-way valve 192 to increase the water inlet flow of port 1 of the second proportional three-way valve 191 and increase the water inlet flow of port 2 of the second proportional three-way valve 192 until the water inlet temperature of the battery pack 160 reaches 25°C to 45°C.;

[0125] like Figure 8As shown, in the battery pack heating mode, the electric drive waste heat utilization mode and the air source heat pump heating mode, the twelve-way valve is controlled to be in the sixth working mode, that is, the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all opened, and the second port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected. The WCON121, the Chiller122, the low-temperature radiator 150, the battery pack 160, the electric drive system 170, the first water pump 181, the second water pump 182, the third water pump 183, the fourth water pump 184, the first proportional three-way valve 191 and the second proportional three-way valve 192 are opened, and the coolant enters the coolant side inlet of the WCON121 under the drive of the fourth water pump 184. The water flows out through the coolant side outlet of the WCON 121 and enters the second port of the twelve-way valve 140, flows out through the second port of the twelve-way valve 140 and enters the 11th port of the twelve-way valve 140, flows out through the 11th port of the twelve-way valve 140 and enters the No. 1 port of the first proportional three-way valve 191, flows out through the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181, flows out through the outlet of the first water pump 181 and enters the coolant inlet of the battery pack 160, flows out through the coolant outlet of the battery pack 160 and enters the No. 1 port of the second proportional three-way valve 192, flows out through the No. 2 port of the second proportional three-way valve 192 and enters the No. 12 port of the twelve-way valve 140, flows out through the No. 12 port of the twelve-way valve 140 and enters the No. 3 port of the twelve-way valve 140, and flows out through the No. 3 port of the twelve-way valve 140 and enters the inlet of the fourth water pump 184, forming a circulation loop;At the same time, the coolant enters the coolant side inlet of the chiller 122 driven by the third water pump 183, flows out through the coolant side outlet of the chiller 122 and enters the 7th port of the 12-way valve 140, flows out through the 7th port of the 12-way valve 140 and enters the 4th port of the 12-way valve 140, flows out through the 4th port of the 12-way valve 140 and enters the inlet of the low-temperature radiator 150, flows out through the outlet of the low-temperature radiator 150 and enters the 5th port of the 12-way valve 140, and flows out through the 5th port of the 12-way valve 140. Flow out and enter the 9th port of the 12-way valve 140, flow out through the 9th port of the 12-way valve 140 and enter the inlet of the second water pump 182, flow out through the outlet of the second water pump 182 and enter the coolant side inlet of the electric drive system 170, flow out through the coolant side outlet of the electric drive system 170 and enter the 10th port of the 12-way valve 140, flow out through the 10th port of the 12-way valve 140 and enter the 6th port of the 12-way valve 140, and flow out through the 6th port of the 12-way valve 140 and enter the inlet of the third water pump 183, forming a circulation loop. ;

[0126] like Fig. 9As shown, in the battery pack heating mode and the air source heat pump heating mode, the twelve-way valve is controlled to be in the seventh working mode, that is, the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the second port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the sixth port are interconnected, and the WCON121, the Chiller122, the low-temperature radiator 150, the battery pack 160, the first water pump 181, the third water pump 183, the fourth water pump 184 are connected to each other. The pump 184, the first proportional three-way valve 191 and the second proportional three-way valve 192 are opened, and the coolant enters the coolant side inlet of the WCON 121 under the drive of the fourth water pump 184, flows out through the coolant side outlet of the WCON 121 and enters the second port of the twelve-way valve 140, flows out through the second port of the twelve-way valve 140 and enters the 11th port of the twelve-way valve 140, flows out through the 11th port of the twelve-way valve 140 and enters the No. 1 port of the first proportional three-way valve 191, flows out through the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181, and flows out through the No. 1 port of the twelve-way valve 140. The outlet of the first water pump 181 flows out into the coolant inlet of the battery pack 160, flows out through the coolant outlet of the battery pack 160 into port No. 1 of the second proportional three-way valve 192, flows out through port No. 2 of the second proportional three-way valve 192 into port No. 12 of the twelve-way valve 140, flows out through port No. 12 of the twelve-way valve 140 into port No. 3 of the twelve-way valve 140, flows out through port No. 3 of the twelve-way valve 140 into the inlet of the fourth water pump 184, forming a circulation loop; at the same time, the coolant enters the cooling port of the Chiller 122 driven by the third water pump 183. The liquid flows out from the liquid side inlet through the coolant side outlet of the Chiller 122 and enters the 7th port of the 12-way valve 140, flows out from the 7th port of the 12-way valve 140 and enters the 4th port of the 12-way valve 140, flows out from the 4th port of the 12-way valve 140 and enters the inlet of the low-temperature radiator 150, flows out from the outlet of the low-temperature radiator 150 and enters the 5th port of the 12-way valve 140, flows out from the 5th port of the 12-way valve 140 and enters the 6th port of the 12-way valve 140, and flows out from the 6th port of the 12-way valve 140 and enters the inlet of the third water pump 183, forming a circulation loop.

[0127] like Fig.10As shown, in the driving defrost mode, the twelve-way valve is controlled to be in the eighth working mode, that is, the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port and the tenth port of the twelve-way valve 140 are all opened, and the first port and the fourth port are interconnected, the fifth port and the third port are interconnected, the eighth port and the ninth port are interconnected, the sixth port and the tenth port are interconnected, and the warm air core 111, the cold air core 112, the WCON121, the Chiller122, the low-temperature radiator 150, the electric drive system 170, the second water pump 182, the third water pump 183 and The fourth water pump 184 is turned on, and the coolant enters the coolant side inlet of the WCON 121 driven by the fourth water pump 184, flows out through the coolant side outlet of the WCON 121 and enters the heater core 111 in the passenger compartment HVAC assembly, flows out through the heater core 111 in the passenger compartment HVAC assembly and enters the first port of the twelve-way valve 140, flows out through the first port of the twelve-way valve 140 and enters the fourth port of the twelve-way valve 140, flows out through the fourth port of the twelve-way valve 140 and enters the inlet of the low-temperature radiator 150, and flows out through the outlet of the low-temperature radiator 150 and enters The coolant flows out of the 5th port of the 12-way valve 140 through the 5th port of the 12-way valve 140 and enters the 3rd port of the 12-way valve 140, and flows out through the 3rd port of the 12-way valve 140 and enters the inlet of the fourth water pump 184 to form a circulation loop; at the same time, the coolant enters the coolant side inlet of the Chiller 122 driven by the third water pump 183, flows out through the coolant side outlet of the Chiller 122 and enters the cooling air core 112 in the passenger compartment HVAC assembly, and flows out through the cooling air core 112 in the passenger compartment HVAC assembly and enters the cooling air core 112 of the 12-way valve 140. The water flows out through the 8th port of the 12-way valve 140 and enters the 9th port of the 12-way valve 140, flows out through the 9th port of the 12-way valve 140 and enters the inlet of the second water pump 182, flows out through the outlet of the second water pump 182 and enters the coolant inlet of the electric drive system 170, flows out through the coolant outlet of the electric drive system 170 and enters the 10th port of the 12-way valve 140, flows out through the 10th port of the 12-way valve 140 and enters the 6th port of the 12-way valve 140, and flows out through the 6th port of the 12-way valve 140 and enters the inlet of the third water pump 183, forming a circulation loop.

[0128] like Fig.11As shown, in the passenger compartment dehumidification mode, battery pack no-demand mode, electric drive waste heat utilization mode and air source heat pump heating mode, the twelve-way valve is controlled to be in the ninth working mode, that is, the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port and the tenth port of the twelve-way valve 140 are all open, and the first port and the third port are interconnected, the fourth port and the eighth port are interconnected, the fifth port and the ninth port are interconnected, the sixth port and the tenth port are interconnected, and the warm air core 111, the cold air core 112, the WCON121, the Chiller122, the low The radiator 150, the electric drive system 170, the second water pump 182, the third water pump 183 and the fourth water pump 184 are turned on. The coolant is driven by the fourth water pump 184 to be sent to the coolant side inlet of the WCON 121, flows out through the coolant side outlet of the WCON 121, enters the coolant inlet of the heater core 111 in the passenger compartment HVAC assembly, flows out through the coolant outlet of the heater core 111 in the passenger compartment HVAC assembly, enters the first port of the twelve-way valve 140, flows out through the first port of the twelve-way valve 140, enters the third port of the twelve-way valve 140, and flows out through the first port of the twelve-way valve 140. The coolant flows out from the third port of the 12-way valve 140 and enters the inlet of the fourth water pump 184 to form a circulation loop; at the same time, the coolant is driven by the third water pump 183 to be sent to the coolant side inlet of the Chiller 122, flows out through the coolant side outlet of the Chiller 122 and enters the cooling air core 112 in the passenger compartment HVAC assembly, flows out through the cooling air core 112 in the passenger compartment HVAC assembly and enters the 8th port of the 12-way valve 140, flows out through the 8th port of the 12-way valve 140 and enters the 4th port of the 12-way valve 140, and flows out through the 4th port of the 12-way valve 140 and enters the low temperature The water flows out from the inlet of the radiator 150 through the outlet of the low-temperature radiator 150 and enters the 5th port of the 12-way valve 140, flows out from the 9th port of the 12-way valve 140 and enters the inlet of the second water pump 182, flows out from the outlet of the second water pump 182 and enters the coolant inlet of the electric drive system 170, flows out from the coolant outlet of the electric drive system 170 and enters the 10th port of the 12-way valve 140, flows out from the 10th port of the 12-way valve 140 and enters the 6th port of the 12-way valve 140, and flows out from the 6th port of the 12-way valve 140 and the inlet of the third water pump 183 to form a circulation loop.

[0129] like Fig.12As shown, in the battery pack cooling mode and the electric drive heat dissipation mode, the twelve-way valve is controlled to be in the tenth working mode, that is, the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the second port and the fourth port are interconnected, the third port and the fifth port are interconnected, the seventh port and the eleventh port are interconnected, the ninth port and the twelfth port are interconnected, and the sixth port and the tenth port are interconnected. The WCON121, the Chiller122, the low-temperature radiator 150, the battery pack 160, the electric drive system 170, the first water pump 181, the second water pump 182, the third water pump 183, the fourth water pump 184, the first proportional three-way valve 191 and the second proportional three-way valve 192 are opened, and the coolant enters the coolant side inlet of WCON121 under the drive of the fourth water pump 184, flows out through the coolant side outlet of WCON121 and enters the second port of the twelve-way valve 140, flows out through the second port of the twelve-way valve 140 and enters the fourth port of the twelve-way valve 140, flows out through the fourth port of the twelve-way valve 140 and enters the inlet of the low-temperature radiator 150, flows out through the outlet of the low-temperature radiator 150 and enters the fifth port of the twelve-way valve 140, flows out through the fifth port of the twelve-way valve 140 and enters the third port of the twelve-way valve 140, and flows out through the third port of the twelve-way valve 140 and enters the inlet of the fourth water pump 184, forming a circulation loop;At the same time, the coolant enters the coolant side inlet of the Chiller 122 driven by the third water pump 183, flows out through the coolant side outlet of the Chiller 122 and enters the 7th port of the 12-way valve 140, flows out through the 7th port of the 12-way valve 140 and enters the 11th port of the 12-way valve 140, flows out through the 11th port of the 12-way valve 140 and enters the No. 1 port of the first proportional three-way valve 191, and part of the coolant flows out through the No. 2 port of the first proportional three-way valve 191 and enters the inlet of the first water pump 181, and flows out through the outlet of the first water pump 181 and enters the battery The cooling liquid inlet of the battery pack 160 flows out through the cooling liquid outlet of the battery pack 160 and enters the No. 1 port of the second proportional three-way valve 192. Part of the cooling liquid flows out through the No. 3 port of the second proportional three-way valve 192 and mixes with part of the cooling liquid flowing out through the No. 2 port of the first proportional three-way valve 191 and enters the first water pump 181. Part of the cooling liquid flows out through the No. 2 port of the second proportional three-way valve 192 and mixes with part of the cooling liquid flowing out through the No. 3 port of the first proportional three-way valve 191 and enters the No. 12 port of the twelve-way valve 140. The cooling liquid flows out through the No. 12 port of the twelve-way valve 140 and enters the No. 9 port of the twelve-way valve 140. The water flows out through the 9th port of the 12-way valve 140 and enters the inlet of the second water pump 182, flows out through the outlet of the second water pump 182 and enters the coolant inlet of the electric drive system 170, flows out through the coolant outlet of the electric drive system 170 and enters the 10th port of the 12-way valve 140, flows out through the 10th port of the 12-way valve 140 and enters the 6th port of the 12-way valve 140, and flows out through the 6th port of the 12-way valve 140 and enters the inlet of the third water pump 183, forming a circulation loop; wherein, the first ratio of the third water pump 183 is adjusted by feedback of the coolant inlet temperature by the temperature sensor at the inlet of the battery pack 160. The water flow distribution ratio of the No. 2 and No. 3 ports of the three-way valve 191 and the water flow distribution ratio of the No. 2 and No. 3 ports of the second proportional three-way valve 192, when the water inlet temperature of the battery pack 160 is higher than 45°C, the valve opening of the first proportional three-way valve 191 is adjusted to increase the water inlet flow of the No. 2 port of the first proportional three-way valve 191 and reduce the water inlet flow of the No. 3 port of the first proportional three-way valve 191. At the same time, the valve opening of the second proportional three-way valve 192 is adjusted to increase the water inlet flow of the No. 1 port of the second proportional three-way valve 192 and increase the water inlet flow of the No. 2 port of the second proportional three-way valve 192 until the water inlet temperature of the battery pack 160 reaches 25°C to 45°C.;

[0130] like Fig.13As shown, in the passenger compartment cooling mode, the battery pack cooling mode and the electric drive heat dissipation mode, the twelve-way valve is controlled to be in the eleventh working mode, that is, the second port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all opened, and the second port and the fourth port are interconnected, the third port and the fifth port are interconnected, the sixth port and the tenth port are interconnected, the eighth port and the eleventh port are interconnected, the ninth port and the twelfth port are interconnected, the cold air core 112, the WCON 121, the Chiller 122, the low-temperature radiator 150, the battery pack 160, the electric drive system 170, the first water pump 181, the second water pump 182, the third water pump 183, the fourth water pump 184 4. The first proportional three-way valve 191 and the second proportional three-way valve 192 are opened. The coolant enters the coolant side inlet of WCON121 driven by the fourth water pump 184, flows out through the coolant side outlet of WCON121 and enters the second port of the twelve-way valve 140, flows out through the second port of the twelve-way valve 140 and enters the fourth port of the twelve-way valve 140, flows out through the fourth port of the twelve-way valve 140 and enters the inlet of the low-temperature radiator 150, flows out through the outlet of the low-temperature radiator 150 and enters the fifth port of the twelve-way valve 140, flows out through the fifth port of the twelve-way valve 140 and enters the third port of the twelve-way valve 140, and flows out through the third port of the twelve-way valve 140 and enters the inlet of the fourth water pump 184, forming a circulation loop;At the same time, the coolant enters the coolant side inlet of the chiller 122 driven by the third water pump 183, flows out through the coolant side outlet of the chiller 122 and enters the inlet of the cooling air core 112 in the passenger compartment HVAC assembly, flows out through the outlet of the cooling air core 112 in the passenger compartment HVAC assembly and enters the 8th port of the 12-way valve 140, flows out through the 8th port of the 12-way valve 140 and enters the 11th port of the 12-way valve 140, flows out through the 11th port of the 12-way valve 140 and enters the No. 1 port of the first proportional three-way valve 191, and part of the coolant flows out through the No. 2 port of the first proportional three-way valve 191. The cooling liquid flows out through the outlet of the first water pump 181 and enters the coolant inlet of the battery pack 160, flows out through the coolant outlet of the battery pack 160 and enters the No. 1 port of the second proportional three-way valve 192, part of the coolant flows out through the No. 3 port of the second proportional three-way valve 192 and mixes with part of the coolant flowing out through the No. 2 port of the first proportional three-way valve 191 and enters the first water pump 181, part of the coolant flows out through the No. 2 port of the second proportional three-way valve 192 and mixes with part of the coolant flowing out through the No. 3 port of the first proportional three-way valve 191 and enters the No. 12 port of the twelve-way valve 140, and flows out through the No. 12 port of the twelve-way valve 14 0 flows out from the 12th port and enters the 9th port of the 12-way valve 140, flows out through the 9th port of the 12-way valve 140 and enters the inlet of the second water pump 182, flows out through the outlet of the second water pump 182 and enters the coolant inlet of the electric drive system 170, flows out through the coolant outlet of the electric drive system 170 and enters the 10th port of the 12-way valve 140, flows out through the 10th port of the 12-way valve 140 and enters the 6th port of the 12-way valve 140, and flows out through the 6th port of the 12-way valve 140 and enters the inlet of the third water pump 183, forming a circulation loop; wherein, the coolant inlet is fed back through the temperature sensor at the inlet of the battery pack 160 Adjust the water flow distribution ratio of the No. 2 and No. 3 ports of the first proportional three-way valve 191 and the No. 2 and No. 3 ports of the second proportional three-way valve 192 by temperature. When the water inlet temperature of the battery pack 160 is higher than 45°C, adjust the valve opening of the first proportional three-way valve 191 to increase the water inlet flow of the No. 2 port of the first proportional three-way valve 191 and reduce the water inlet flow of the No. 3 port of the first proportional three-way valve 191. At the same time, adjust the valve opening of the second proportional three-way valve 192 to increase the water inlet flow of the No. 1 port of the second proportional three-way valve 192 and increase the water inlet flow of the No. 2 port of the second proportional three-way valve 192 until the water inlet temperature of the battery pack 160 reaches 25°C to 45°C.;

[0131] The present invention designs and develops a control method for a whole-vehicle thermal management system of an electric vehicle based on a multi-way valve. Through the twelve-way valve, each thermal management module can be controlled individually and collaboratively, which can greatly improve the energy efficiency of the thermal management system and ensure that the system can operate stably under various working conditions. In addition, the twelve-way valve is combined with the full indirect heat pump technology to expand the combination of different working modes of each thermal management module of the electric vehicle. While meeting the needs of various thermal management modes of the electric vehicle, the energy beneficial utilization of the thermal management system is maximized, the problem of effective utilization of energy in the entire charging and discharging cycle of the electric vehicle is solved, the battery life of the electric vehicle is improved, and a more lasting travel guarantee is provided for users.

[0132] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A thermal management system for an electric vehicle based on a multi-way valve, characterized in that: include: 12-way valve; as well as a fourth water pump, the inlet of which is connected to the third port of the twelve-way valve; A first heat exchanger, wherein a coolant-side inlet is connected to the outlet of the fourth water pump, and a coolant-side outlet is connected to the second port of the twelve-way valve; a heater core, the inlet of which is connected to both the coolant outlet of the first heat exchanger and the second port of the twelve-way valve, and the outlet of which is connected to the first port of the twelve-way valve; A low-temperature radiator, two ends of which are respectively connected to the fourth port and the fifth port of the twelve-way valve; a third water pump, the inlet of which is connected to the sixth port of the twelve-way valve; A second heat exchanger, whose coolant side inlet is connected to the outlet of the third water pump, and whose coolant side outlet is connected to the seventh port of the twelve-way valve; A cold air core, the inlet of which is connected to both the coolant side outlet of the second heat exchanger and the seventh port of the twelve-way valve, and the outlet of which is connected to the eighth port of the twelve-way valve; An electric drive system loop, one end of which is connected to the ninth port of the twelve-way valve, and the other end of which is connected to the tenth port of the twelve-way valve; A battery pack loop, one end of which is connected to the 11th port of the 12-way valve, and the other end of which is connected to the 12th port of the 12-way valve, and the two ends of the battery pack loop can be selectively connected or disconnected with each other; The refrigerant side of the first heat exchanger and the refrigerant side of the second heat exchanger can be selectively connected or disconnected with each other.

2. The electric vehicle thermal management system based on a multi-way valve as claimed in claim 1, characterized in that: The battery pack circuit comprises: a first proportional three-way valve, whose port No. 1 is connected to the port No. 11 of the twelve-way valve, and whose port No. 3 is connected to the port No. 12 of the twelve-way valve; a second proportional three-way valve, whose port No. 2 is connected to both the port No. 3 of the first proportional three-way valve and the port No. 12 of the twelve-way valve, and whose port No. 3 is connected to the port No. 2 of the first proportional three-way valve; a first water pump, an inlet of which is connected to port No. 2 of the first proportional three-way valve and port No. 3 of the second proportional three-way valve; The coolant inlet of the battery pack is connected to the outlet of the first water pump, and the coolant outlet is connected to port No. 1 of the second proportional three-way valve.

3. The electric vehicle thermal management system based on a multi-way valve as claimed in claim 2, characterized in that: The electric drive system circuit includes: a second water pump, the inlet of which is connected to the ninth port of the twelve-way valve; The electric drive system has a coolant inlet connected to the outlet of the second water pump, and a coolant outlet connected to the tenth port of the twelve-way valve.

4. The electric vehicle thermal management system based on a multi-way valve as claimed in claim 3, characterized in that: Also includes: a first kettle, one end of which is connected to the coolant inlet of the second heat exchanger, and the other end of which is connected to the coolant outlet of the second heat exchanger; The second kettle has one end connected to the coolant inlet of the first heat exchanger and the other end connected to the coolant outlet of the first heat exchanger.

5. The electric vehicle thermal management system based on a multi-way valve as claimed in claim 4, characterized in that: Also includes: a compressor, the inlet of which is connected to the refrigerant-side outlet of the second heat exchanger, and the outlet of which is connected to the refrigerant-side inlet of the first heat exchanger; a liquid storage tank, the inlet of which is connected to the refrigerant-side outlet of the first heat exchanger; An electronic expansion valve has one end connected to the outlet of the liquid storage tank and the other end connected to the refrigerant side inlet of the second heat exchanger.

6. The electric vehicle thermal management system based on a multi-way valve as claimed in claim 5, characterized in that: Also includes: A temperature sensor is arranged at a coolant inlet of the battery pack.

7. The electric vehicle thermal management system based on a multi-way valve as claimed in claim 6, characterized in that: The second water pump, the third water pump and the fourth water pump are integrated on the twelve-way valve.

8. A control method for a thermal management system of an electric vehicle based on a multi-way valve, using the thermal management system of an electric vehicle based on a multi-way valve as claimed in any one of claims 1 to 7, characterized in that: The steps include: Step 1: Collect multiple vehicle status parameters; The multiple vehicle status parameters include vehicle speed, temperature and humidity in the passenger compartment, battery pack temperature, electric drive system temperature, and driver intention; Step 2: starting and switching different modes according to the multiple vehicle status parameters; The starting and switching of different modes include: If the passenger compartment temperature is lower than 25°C and the vehicle speed is lower than 25 km / h, the passenger compartment heating mode, battery pack no-demand mode, electric drive reduced efficiency heating mode and air source heat pump heating mode are activated to make the passenger compartment temperature reach or maintain at 25°C; If the passenger compartment temperature is lower than 25°C and the vehicle speed is higher than 25 km / h, the passenger compartment heating mode, battery pack no-demand mode and air source heat pump heating mode are activated to make the passenger compartment temperature reach or maintain at 25°C; If the battery pack is in the initial charging state and the battery pack temperature is lower than 25°C, the passenger compartment heating mode, battery pack heating mode, electric drive reduced efficiency heating supplementary heating mode and air source heat pump heating mode are activated to make the temperature in the passenger compartment reach or maintain at 25°C; If the passenger compartment temperature is below 25°C and the battery pack is in charging state, the passenger compartment heating mode, battery pack heating mode and air source heat pump heating mode are activated so that the temperature in the passenger compartment reaches or remains at 25°C and the battery pack temperature remains at 25°C; If the humidity in the passenger compartment is higher than 60%, the battery pack temperature is lower than 25°C, the electric drive system temperature is higher than 85°C and the battery pack is in the initial charging state, the passenger compartment heating mode, battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode are activated to maintain the battery pack temperature at 25°C; If the battery pack is in the initial charging state, the battery pack temperature is lower than 25°C and the electric drive system temperature is higher than 185°C, the battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode are activated; If the battery pack is in charging state and the battery pack temperature is lower than 25°C, the battery pack heating mode and the air source heat pump heating mode are started to keep the battery pack temperature above 25°C; If the front windshield of the passenger compartment is frosted, the driver activates the driving defrost mode; If the humidity in the passenger compartment is higher than 60% and the temperature of the electric drive system is higher than 85°C, the passenger compartment dehumidification mode, battery pack no-demand mode, electric drive waste heat utilization mode and air source heat pump heating mode are activated; If the temperature in the passenger compartment is 25°C, the battery pack temperature is higher than 45°C, and the electric drive system temperature is higher than 85°C, the battery pack cooling mode and the electric drive heat dissipation mode will be activated; If the temperature in the passenger compartment is higher than 25°C, the battery pack temperature is higher than 45°C and the electric drive system temperature is higher than 85°C, the passenger compartment cooling mode, battery pack cooling mode and electric drive heat dissipation mode will be activated.

9. The control method of the electric vehicle thermal management system based on a multi-way valve as claimed in claim 8, characterized in that: The step 2 specifically includes: When the passenger compartment heating mode, the battery pack no-demand mode, the electric drive reduced-efficiency heating mode, and the air source heat pump heating mode are all started, the twelve-way valve is in the first working mode, and the heater core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the electric drive system, the second water pump, the third water pump, and the fourth water pump are turned on; In the passenger compartment heating mode, the battery pack no-demand mode and the air source heat pump heating mode, the twelve-way valve is in the second working mode, and the heater core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the third water pump and the fourth water pump are turned on; In the passenger compartment heating mode, battery pack heating mode, electric drive reduced efficiency heating supplementary heating mode and air source heat pump heating mode, the twelve-way valve is in the third working mode, and the heater core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened; In the passenger compartment heating mode, the battery pack heating mode and the air source heat pump heating mode, the twelve-way valve is in the fourth working mode, and the heater core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the first water pump, the third water pump, the fourth water pump, the first proportional three-way valve, and the second proportional three-way valve are opened; In the passenger compartment heating mode, battery pack heating mode, electric drive waste heat utilization mode and air source heat pump heating mode, the twelve-way valve is in the fifth working mode, and the warm air core, the cold air core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened; In the battery pack heating mode, the electric drive waste heat utilization mode and the air source heat pump heating mode, the twelve-way valve is in the sixth working mode, and the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened; In the battery pack heating mode and the air source heat pump heating mode, the twelve-way valve is in the seventh working mode, and the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the first water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened; In the driving defrost mode, the twelve-way valve is in the eighth working mode, and the warm air core, the cold air core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the electric drive system, the second water pump, the third water pump and the fourth water pump are turned on; In the passenger compartment dehumidification mode, the battery pack no-demand mode, the electric drive waste heat utilization mode and the air source heat pump heating mode, the twelve-way valve is in the ninth working mode, and the warm air core, the cold air core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the electric drive system, the second water pump, the third water pump and the fourth water pump are turned on; In the battery pack cooling mode and the electric drive heat dissipation mode, the twelve-way valve is in the tenth working mode, and the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened; In the passenger compartment cooling mode, battery pack cooling mode and electric drive heat dissipation mode, the twelve-way valve is in the eleventh working mode, and the cold air core, the first heat exchanger, the second heat exchanger, the low-temperature radiator, the battery pack, the electric drive system, the first water pump, the second water pump, the third water pump, the fourth water pump, the first proportional three-way valve and the second proportional three-way valve are opened.

10. The control method of the electric vehicle thermal management system based on a multi-way valve as claimed in claim 9, characterized in that: The mode switching of the twelve-way valve includes: The first working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port and the tenth port of the twelve-way valve 140 are all open, and the first port and the third port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected; The second working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port and the seventh port of the twelve-way valve are all open, and the first port and the third port are interconnected, the fourth port and the seventh port are interconnected, and the fifth port and the sixth port are interconnected; The third working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected; The fourth working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, and the fifth port and the sixth port are interconnected. The fifth working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port, the tenth port, the eleventh port, and the twelfth port of the twelve-way valve are all open, and the first port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the eighth port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected; The sixth working mode is that the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the second port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected; The seventh working mode is that the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the second port and the eleventh port are interconnected, the third port and the twelfth port are interconnected, the fourth port and the seventh port are interconnected, and the fifth port and the sixth port are interconnected; The eighth working mode is that the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port and the tenth port of the twelve-way valve 140 are all open, and the first port and the fourth port are interconnected, the fifth port and the third port are interconnected, the eighth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected; In the ninth working mode, the first port, the third port, the fourth port, the fifth port, the sixth port, the eighth port, the ninth port and the tenth port of the twelve-way valve 140 are all open, and the first port and the third port are interconnected, the fourth port and the eighth port are interconnected, the fifth port and the ninth port are interconnected, and the sixth port and the tenth port are interconnected; The tenth working mode is that the second port, the third port, the fourth port, the fifth port, the sixth port, the seventh port, the ninth port, the tenth port, the eleventh port and the twelfth port of the twelve-way valve 140 are all open, and the second port and the fourth port are interconnected, the third port and the fifth port are interconnected, the seventh port and the eleventh port are interconnected, the ninth port and the twelfth port are interconnected, and the sixth port and the tenth port are interconnected; The eleventh working mode is that the 2nd port, 3rd port, 4th port, 5th port, 6th port, 8th port, 9th port, 10th port, 11th port and 12th port of the twelve-way valve 140 are all open, and the 2nd port and the 4th port are interconnected, the 3rd port and the 5th port are interconnected, the 6th port and the 10th port are interconnected, the 8th port and the 11th port are interconnected, and the 9th port and the 12th port are interconnected.

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